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-74-8x=31-15x
We move all terms to the left:
-74-8x-(31-15x)=0
We add all the numbers together, and all the variables
-8x-(-15x+31)-74=0
We get rid of parentheses
-8x+15x-31-74=0
We add all the numbers together, and all the variables
7x-105=0
We move all terms containing x to the left, all other terms to the right
7x=105
x=105/7
x=15
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